| ... | ... | @@ -0,0 +1,86 @@ |
| 1 | /** |
| 2 | * This file has no copyright assigned and is placed in the Public Domain. |
| 3 | * This file is part of the mingw-w64 runtime package. |
| 4 | * No warranty is given; refer to the file DISCLAIMER.PD within this package. |
| 5 | */ |
| 6 | #include <windows.h> |
| 7 | #include <stdarg.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | #include <errno.h> |
| 12 | |
| 13 | /* emulation of _vscprintf() via _vsnprintf() */ |
| 14 | static int __cdecl emu_vscprintf(const char * __restrict__ format, va_list arglist) |
| 15 | { |
| 16 | char *buffer, *new_buffer; |
| 17 | size_t size; |
| 18 | int ret; |
| 19 | |
| 20 | /* if format is a null pointer, _vscprintf() returns -1 and sets errno to EINVAL */ |
| 21 | if (!format) { |
| 22 | _set_errno(EINVAL); |
| 23 | return -1; |
| 24 | } |
| 25 | |
| 26 | /* size for _vsnprintf() must be non-zero and buffer must have place for terminating null character */ |
| 27 | size = strlen(format) * 2 + 1; |
| 28 | buffer = malloc(size); |
| 29 | |
| 30 | if (!buffer) { |
| 31 | _set_errno(ENOMEM); |
| 32 | return -1; |
| 33 | } |
| 34 | |
| 35 | /* if the number of characters to write is greater than size, _vsnprintf() returns -1 */ |
| 36 | while (size < SIZE_MAX/2 && (ret = _vsnprintf(buffer, size, format, arglist)) < 0) { |
| 37 | /* in this case try with larger buffer */ |
| 38 | size *= 2; |
| 39 | new_buffer = realloc(buffer, size); |
| 40 | if (!new_buffer) |
| 41 | break; |
| 42 | buffer = new_buffer; |
| 43 | } |
| 44 | |
| 45 | free(buffer); |
| 46 | |
| 47 | if (ret < 0) { |
| 48 | _set_errno(ENOMEM); |
| 49 | return -1; |
| 50 | } |
| 51 | |
| 52 | return ret; |
| 53 | } |
| 54 | |
| 55 | #ifndef __LIBMSVCRT_OS__ |
| 56 | |
| 57 | int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__, va_list) = emu_vscprintf; |
| 58 | |
| 59 | #else |
| 60 | |
| 61 | #include <msvcrt.h> |
| 62 | |
| 63 | static int __cdecl init_vscprintf(const char * __restrict__ format, va_list arglist); |
| 64 | |
| 65 | int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__, va_list) = init_vscprintf; |
| 66 | |
| 67 | static int __cdecl init_vscprintf(const char * __restrict__ format, va_list arglist) |
| 68 | { |
| 69 | HMODULE msvcrt = __mingw_get_msvcrt_handle(); |
| 70 | int (__cdecl *func)(const char * __restrict__, va_list) = NULL; |
| 71 | |
| 72 | if (msvcrt) |
| 73 | func = (int (__cdecl *)(const char * __restrict__, va_list))GetProcAddress(msvcrt, "_vscprintf"); |
| 74 | |
| 75 | if (!func) |
| 76 | func = emu_vscprintf; |
| 77 | |
| 78 | return (__MINGW_IMP_SYMBOL(_vscprintf) = func)(format, arglist); |
| 79 | } |
| 80 | |
| 81 | #endif |
| 82 | |
| 83 | int __cdecl _vscprintf(const char * __restrict__ format, va_list arglist) |
| 84 | { |
| 85 | return __MINGW_IMP_SYMBOL(_vscprintf)(format, arglist); |
| 86 | } |
Andrew Kelley <andrew@ziglang.org> 2022-12-28 02:22:56-07:00
lib